<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script type="text/javascript">
			var x = "123";
			var y = 123;
			if (x == y) {
				console.log("m == y");
			}
			if (x === y) {
				console.log("x === y");
			}
			var str1 = "张三";
			var sr2 = new String("李四");
			console.log(str1.length);
			var str3 = "Hello Java";
			console.log(str3.toLowerCase());
			console.log(str3.toUpperCase());
		</script>
	</head>
	<body>
	</body>
</html>
